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zopu-code/repos/effect/.changeset/add-flag-hidden.md

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---
"effect": patch
---
Add `Flag.withHidden` (and `Param.withHidden`) to hide flags from `--help` output and shell completions while keeping them fully parseable on the command line.
Useful for experimental, internal, or deprecated flags that should be accepted but not advertised, e.g. `--experimental-foo`, debug toggles, or escape hatches that are not yet committed to the public CLI surface.
```ts
import { Flag } from "effect/unstable/cli"
const experimental = Flag.boolean("experimental-foo").pipe(
Flag.withHidden
)
```